Greenland Subglacial Drainage Evolution Regulated by Weakly Connected Regions of the Bed
Penetration of surface meltwater to the bed of the Greenland Ice Sheet each summer causes an initial increase in ice speed due to elevated basal water pressure, followed by slowdown in late summer that continues into fall and winter. While this seasonal pattern is commonly explained by an evolution...
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ftdartmouthcoll:oai:digitalcommons.dartmouth.edu:facoa-3762 2023-07-16T03:58:40+02:00 Greenland Subglacial Drainage Evolution Regulated by Weakly Connected Regions of the Bed Hoffman, Matthew J Andrews, Lauren C Price, Stephen A Catania, Ginny A Neumann, Thomas A Luthi, Martin P Gulley, Jason Ryser, Claudia Hawley, Robert L Morris, Blaine 2016-12-19T08:00:00Z application/pdf https://digitalcommons.dartmouth.edu/facoa/2748 https://doi.org/10.1038/ncomms13903 https://digitalcommons.dartmouth.edu/context/facoa/article/3762/viewcontent/ptpmcrender.fcgi unknown Dartmouth Digital Commons https://digitalcommons.dartmouth.edu/facoa/2748 doi:10.1038/ncomms13903 https://digitalcommons.dartmouth.edu/context/facoa/article/3762/viewcontent/ptpmcrender.fcgi Dartmouth Scholarship greenland ice sheet gris ablation annual variations drainage drainage patterns flow equations greenland hydrology hydrology models ice ice environments leakage mathematical models melting water pressure Earth Sciences Glaciology Physical Sciences and Mathematics text 2016 ftdartmouthcoll https://doi.org/10.1038/ncomms13903 2023-06-28T10:43:56Z Penetration of surface meltwater to the bed of the Greenland Ice Sheet each summer causes an initial increase in ice speed due to elevated basal water pressure, followed by slowdown in late summer that continues into fall and winter. While this seasonal pattern is commonly explained by an evolution of the subglacial drainage system from an inefficient distributed to efficient channelized configuration, mounting evidence indicates that subglacial channels are unable to explain important aspects of hydrodynamic coupling in late summer and fall. Here we use numerical models of subglacial drainage and ice flow to show that limited, gradual leakage of water and lowering of water pressure in weakly connected regions of the bed can explain the dominant features in late and post melt season ice dynamics. These results suggest that a third weakly connected drainage component should be included in the conceptual model of subglacial hydrology. Text Greenland Ice Sheet Dartmouth Digital Commons (Dartmouth College) Greenland Nature Communications 7 1 |
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topic |
greenland ice sheet gris ablation annual variations drainage drainage patterns flow equations greenland hydrology hydrology models ice ice environments leakage mathematical models melting water pressure Earth Sciences Glaciology Physical Sciences and Mathematics |
spellingShingle |
greenland ice sheet gris ablation annual variations drainage drainage patterns flow equations greenland hydrology hydrology models ice ice environments leakage mathematical models melting water pressure Earth Sciences Glaciology Physical Sciences and Mathematics Hoffman, Matthew J Andrews, Lauren C Price, Stephen A Catania, Ginny A Neumann, Thomas A Luthi, Martin P Gulley, Jason Ryser, Claudia Hawley, Robert L Morris, Blaine Greenland Subglacial Drainage Evolution Regulated by Weakly Connected Regions of the Bed |
topic_facet |
greenland ice sheet gris ablation annual variations drainage drainage patterns flow equations greenland hydrology hydrology models ice ice environments leakage mathematical models melting water pressure Earth Sciences Glaciology Physical Sciences and Mathematics |
description |
Penetration of surface meltwater to the bed of the Greenland Ice Sheet each summer causes an initial increase in ice speed due to elevated basal water pressure, followed by slowdown in late summer that continues into fall and winter. While this seasonal pattern is commonly explained by an evolution of the subglacial drainage system from an inefficient distributed to efficient channelized configuration, mounting evidence indicates that subglacial channels are unable to explain important aspects of hydrodynamic coupling in late summer and fall. Here we use numerical models of subglacial drainage and ice flow to show that limited, gradual leakage of water and lowering of water pressure in weakly connected regions of the bed can explain the dominant features in late and post melt season ice dynamics. These results suggest that a third weakly connected drainage component should be included in the conceptual model of subglacial hydrology. |
format |
Text |
author |
Hoffman, Matthew J Andrews, Lauren C Price, Stephen A Catania, Ginny A Neumann, Thomas A Luthi, Martin P Gulley, Jason Ryser, Claudia Hawley, Robert L Morris, Blaine |
author_facet |
Hoffman, Matthew J Andrews, Lauren C Price, Stephen A Catania, Ginny A Neumann, Thomas A Luthi, Martin P Gulley, Jason Ryser, Claudia Hawley, Robert L Morris, Blaine |
author_sort |
Hoffman, Matthew J |
title |
Greenland Subglacial Drainage Evolution Regulated by Weakly Connected Regions of the Bed |
title_short |
Greenland Subglacial Drainage Evolution Regulated by Weakly Connected Regions of the Bed |
title_full |
Greenland Subglacial Drainage Evolution Regulated by Weakly Connected Regions of the Bed |
title_fullStr |
Greenland Subglacial Drainage Evolution Regulated by Weakly Connected Regions of the Bed |
title_full_unstemmed |
Greenland Subglacial Drainage Evolution Regulated by Weakly Connected Regions of the Bed |
title_sort |
greenland subglacial drainage evolution regulated by weakly connected regions of the bed |
publisher |
Dartmouth Digital Commons |
publishDate |
2016 |
url |
https://digitalcommons.dartmouth.edu/facoa/2748 https://doi.org/10.1038/ncomms13903 https://digitalcommons.dartmouth.edu/context/facoa/article/3762/viewcontent/ptpmcrender.fcgi |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Dartmouth Scholarship |
op_relation |
https://digitalcommons.dartmouth.edu/facoa/2748 doi:10.1038/ncomms13903 https://digitalcommons.dartmouth.edu/context/facoa/article/3762/viewcontent/ptpmcrender.fcgi |
op_doi |
https://doi.org/10.1038/ncomms13903 |
container_title |
Nature Communications |
container_volume |
7 |
container_issue |
1 |
_version_ |
1771545912443666432 |